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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>GNUnet FCFS Authority Name Registration Service</title>
    <style>
      html {
          box-sizing: border-box;
          font-family: sans-serif;
      }

      *, *:before, *:after {
          box-sizing: inherit;
      }

      header {
          width: 800px;
          margin: 0 auto;
      }

      main {
          width: 800px;
          margin: 0 auto;
      }

      section h4 {
          text-align: center;
          width: 100%;
      }

      section input {
          width: 100%;
          padding: 8px 17px;
          font-size: 1rem;
          border: 1px solid #aaa;
          border-radius: 7px;
          background-color: white;
          margin-bottom: 7px;
      }

      section input:focus {
          box-shadow: 0px 0px 5px 3px lightblue;
      }

      section button {
          font-size: 1rem;
          font-weight: bold;
          background-color: #8b008b;
          color: white;
          border: none;
          padding: 7px;
      }

      section button:hover {
          background-color: #bf00bf;
      }

      section button:disabled {
          background-color: gray;
      }

      section h3 {
          text-align: center;
          width: 100%;
      }

      section small {
          display: block;
          margin-bottom: 5px;
      }

      .error-message {
          color: red;
      }

      .success-message {
          color: green;
      }

      @media screen and (max-width: 991px) {
          header, main {
              width: 100%;
          }
      }

      footer {
          margin-top: 30px;
          text-align: center;
      }

      nav {
          border-bottom: 1px solid black;
      }

      nav button {
          font-size: 1rem;
          font-weight: bold;
          background-color: #ccc;
          border: 1px solid black;
          border-bottom: none;
          border-top-right-radius: 7px;
          border-top-left-radius: 7px;
          padding: 7px;
      }

      nav button:hover {
          background-color: #f0f0f0;
          cursor: pointer;
      }

      nav button.selected {
          background-color: #f0f0f0;
      }
    </style>
  </head>
  <body>
    <header>
      <h1>Name Registration Service</h1>
      <p>Here you can register a name for your zone as part of this service's
        delegated names.</p>
      <p>The registration is based on a <em>First Come First Served</em>
        policy, meaning a name is given to the first user requesting it.</p>
      <p>Use the search bar below to see if your desired name is available and
      then use the form to submit your registration request.</p>
    </header>
    <main>
      <div class="form-container">
        <nav>
          <button id="tab-search">Search</button>
          <button id="tab-register">Register</button>
        </nav>
        <section id="search-form">
          <h4>Is your name available?</h4>
          <h3 id="search-result-message"></h3>
          <input id="search-name"
                 name="search-name"
                 type="text"
                 placeholder="Your name..."
                 autocomplete="name"
                 maxlength="63"
                 minlength="1">
          <small class="error-message" id="search-name-error"></small>
          <button>Search</button>
        </section>
        <section id="submit-form">
          <h4>Submit a registration request</h4>
          <h3 id="submit-result-message"></h3>
          <input id="register-name"
                 name="register-name"
                 type="text"
                 placeholder="Your name..."
                 autocomplete="off"
                 maxlength="63"
                 minlength="1">
          <input id="register-value"
                 name="register-value"
                 type="text"
                 placeholder="Your zone key..."
                 autocomplete="off"
                 minlength="1">
          <small class="error-message" id="submit-error"></small>
          <button>Submit</button>
        </section>
      </div>
    </main>
    <footer>
      <a href="https://gnunet.org">GNUnet homepage</a>
    </footer>
    <script>
      const buttons = document.querySelectorAll('nav button');
      for (let i=0; i<buttons.length; ++i) {
          buttons[i].onclick = function (e) {
              let selected = document.querySelector('nav button.selected');
              if (selected) {
                  selected.classList.toggle('selected');
              }
              e.target.classList.toggle('selected');

              let show = '';
              let hide = '';
              if (e.target.id === 'tab-search') {
                  show = 'search-form';
                  hide = 'submit-form';
              } else {
                  show = 'submit-form';
                  hide = 'search-form'
              }

              document.getElementById(hide).style.display = 'none';
              document.getElementById(show).style.display = 'block';
          };
      }

      buttons[0].click({target: buttons[0]});

      const searchbutton = document.querySelector('#search-form button');
      const submitbutton = document.querySelector('#submit-form button');

      document.getElementById('search-name').onkeydown = function (e) {
          if (e.key !== 'Enter') {
              return;
          }

          searchbutton.click();
      };

      for (let n of ['register-name', 'register-value']) {
          document.getElementById(n).onkeydown = function (e) {
              if (e.key !== 'Enter') {
                  return;
              }

              submitbutton.click();
          };
      }

      searchbutton.onclick = function (e) {
          const searchname = document.getElementById('search-name');
          const errormsg = document.getElementById('search-name-error');
          const resultmsg = document.getElementById('search-result-message');

          if (0 === searchname.value.length) {
              errormsg.innerText = 'The field can not be empty';
              searchname.setCustomValidity('The field can not be empty');
              return;
          }

          if (-1 !== searchname.value.indexOf('.')) {
              errormsg.innerText = 'The name can not contain dots';
              searchname.setCustomValidity('The name can not contain dots');
              return;
          }

          searchname.setCustomValidity('');
          errormsg.innerText = '';

          const name = searchname.value.toLowerCase();

          searchbutton.disabled = true;
          submitbutton.disabled = true;

          fetch(`/search?name=${name}`)
              .then(function (response) {
                  if (!response.ok) {
                      throw 'error';
                  }

                  return response.json()
              })
              .then(function (data) {
                  if ("true" === data.free) {
                      resultmsg.innerText = `'${name}' is available!`;
                      resultmsg.classList.add('success-message');
                      resultmsg.classList.remove('error-message');
                  } else {
                      resultmsg.innerText = `'${name}' is not available`;
                      resultmsg.classList.remove('success-message');
                      resultmsg.classList.add('error-message');
                  }
                  searchbutton.disabled = false;
                  submitbutton.disabled = false;
              })
              .catch(function (error) {
                  resultmsg.innerText = 'An error occurred while processing your query';
                  resultmsg.classList.remove('success-message');
                  resultmsg.classList.add('error-message');
                  console.error(error);
                  searchbutton.disabled = false;
                  submitbutton.disabled = false;
              });
      };

      submitbutton.onclick = function (e) {
          const registername = document.getElementById('register-name');
          const registervalue = document.getElementById('register-value');
          const errormsg = document.getElementById('submit-error');
          const resultmsg = document.getElementById('submit-result-message');

          let errors = 0;
          let errs = [];

          if (0 === registername.value.length) {
              errs.push('The name field can not be empty');
              registername.setCustomValidity('The name field can not be empty');
              ++errors;
          }
          if (-1 !== registername.value.indexOf('.')) {
              errs.push('The name can not contain dots');
              registername.setCustomValidity('The name can not contain dots');
              ++errors;
          }
          if (0 === registervalue.value.length) {
              errs.push('The value field can not be empty');
              registervalue.setCustomValidity('The value field can not be empty');
              ++errors;
          }

          if (0 < errors) {
              errormsg.innerHTML = 'The form contains invalid values:';
              for (let e of errs) {
                  errormsg.innerHTML += '<br/>' + e;
              }
              return;
          }

          searchbutton.disabled = true;
          submitbutton.disabled = true;

          fetch('/register', {
              method: 'POST',
              cache: 'no-cache',
              headers: {
                  'Content-Type': 'application/json',
              },
              body: JSON.stringify({
                  name: registername.value,
                  key: registervalue.value,
              }),
          }).then(function (response) {
              return response.json();
          }).then(function (data) {
              if (data.error === "false") {
                  resultmsg.innerText = `'${registername.value}' was registered successfully!`;
                  resultmsg.classList.add('success-message');
                  resultmsg.classList.remove('error-message');
              } else {
                  resultmsg.innerText = `'${registername.value}' could not be registered! (${data.message})`;
                  resultmsg.classList.remove('success-message');
                  resultmsg.classList.add('error-message');
              }
              searchbutton.disabled = false;
              submitbutton.disabled = false;
          }).catch(function (error) {
              resultmsg.innerText = 'An error occurred while processing your query';
              resultmsg.classList.remove('success-message');
              resultmsg.classList.add('error-message');
              console.error(error);
              searchbutton.disabled = false;
              submitbutton.disabled = false;
          });
      };
    </script>
  </body>
</html>